Piston ring



Dec. 1, 1931. w. c. ANDREWS I 1,333,837

PISTON RING Filed Dec. 3, 1930 INVENTOR. W} E. Andrew;

" TTY- Patented Dec. 1, 1931 A UNITED STATES WILLIAM c. nnnnnws'or srnvnnsrmnoiinnnxmiini rrsmonlniivi' Application filed December a. i930, serial.m;;4991gas; jj; Y "fji p My invention relates to improvements in piston rings. 7

One object of my invention, is to provide a piston ring in which the joint between the free. ends thereof will absolutely prevent the passage of gases from back of the ring, by the ring and also prevent the pumping of oil to the cylinder head.

Another object of my invention is to pro- 10 vide a piston ring in which the joint between the free ends of the ring will elfectively seal all passage of gases or oil at all times, that is when the ring is cool and after it has become heated and expanded. V

1 A further object of my invention is to provide a piston ring of this character which is simple in construction and cheaply manufactured and having certain details of structure hereinafter more fully described.

In the accompanying drawings Figure 1 is a top plan View of my improved piston ring.

Figure 2 is a side elevation of Figure 1 partly'broken away. I

Referring now to the drawings 1 represents my improved piston ring which is made of any suitable metal and as is understood by those skilled in the art, fits in the grooves in the wall of the piston.

the width of the grooves in the wall of the piston to allow for expansion thereof so that they will at all times have a free movement therein so that they will snugly engage the walls of the cylinder.

In my improved piston ring one end of the body portion 1 is provided with a horizontal transverse cut 2, the walls 3 and 4 of which are of equal length. While I have shown these walls as arranged at an angle greater than degrees, it will be understood that the same can be arranged at any desired angle without departing from my invention.

The opposite end of'the body portion 1 is 45 provided with a horizontal-transverse V- shaped projection 5, having the two walls 6 and 7 arranged atthe same angle as the walls I 3 and 4: of the transverse cut 2. The wall 6 of the projection 5 as clearly shown in Figure 2 of the drawings is shorter than the wall 7 These rings are of a width slightly less than V a V 3. A- piston ring, comprising a body porwherebythere isaspace 8 left between Wall. y 7 of the projection 5 and wall'3 ofthecutQ. Thisarrangementofwalls insuresithat the I walls of theout 2 and wall6 of the projeor 1 tion fi-willclos'ely engage'atalltimesand thus form a perfect seal to prevent the oi' tward esca'peiof gases that work their wayinf ring grooves of thepiston back o'fthe piston rings.

Bythis arrangement of walls it wiir'betb i seen, that upon the expan'sion of the ring circumferentially, the wall 6 rides up upon the wall 4 of the cut and the. ring assumes the positionshown in dotted lines of Figure 2,- there being sufficient space in the ring grooves to allow the ring toassume this position.

Having thus fully described my invention, what I claim is j 1. A piston ring, comprising a body por n tion having a transverse V-shapedcut in'onet'o end and the other end having a V-shaped projection adapted to enter said out and the walls of the V-shaped out and projection so constructed that but one wall thereof will engage.

2. A piston ring, comprising a body portion having a transverse V-shaped cut'in one end and the other end having a V-shaped pro jection provided with walls of different. u length. i

and the other end of the body portion having .50

a V-shap'ed projection having walls of unequal length and adapted to extend with the transverse V-shaped cut.

5. A piston ring, comprising a body por tion having a horizontal transverse V-shaped cut in one end, the walls of which are of equal length and the other endof the body por tion having a V-shaped projection having walls of unequal length and adapted to extend into the transverse V-shaped' cut.

6. A piston ring comprising a body portion havlng a transverse V-shaped cut in one end and the end having a V-shaped projection adapted to enter said out and the walls of either cut or projection being of different length. 7 p 1 p 7. A ,piston; ring comprising a body portion having a transverse out in one end and the other end having a projection provided with walls of different lengths.

1 8. A piston ring comprising a bodyportion having-a transverse cut in one end and the other end having a correspondingly shaped projection adapted toenter said out and the Walls of the crit and projection so constructed that; but one wall thereof will engage I I J r V 9. A piston ring comprising a body por- V ti on having a transverse outin-one end and the other end having a correspondingly shaped, projection adaptedto. enter said; out

and: the. walls of either the out or being ofi di fierentlen-gths.

Pr j t o signedthis In testimony whereof, I have application. 1 e 7 7 WILLIAM C. ANDREWS. 

